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Fig. C.1.
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Radiative transfer predictions from RADEX for dense gas at nH = 104 with a relative electron abundance ne/nH = 10−5. The HCO+/CO abundance ratio is respectively 50, 80, 100, 120, and 150% of the typical value for the dense gas. The blue, green, and red areas and the black line are the same as in Fig. B.1.
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